One day, ten-year-old Kevin Driscoll discovers a monster inside of his backyard tent Kevin names the creature Crusty Feet because it has the crustiest feet Kevin ever saw in his life No one else knows about Crusty. Not Kevin's mother, or Carrie, his annoying little sister. Kevin is dying to tell someone about his discovery except for Ivan, the school bully. What will Kevin do?

The fun continues when eleven-year-old Kevin Driscoll decides to bring Crusty Feet, a monster from the woods, inside of his house. No one else knows about Crusty except for Tyler and Luis, Kevin's best friends. Kevin knows it's tough enough to keep Crusty a secret from his mother, but even harder to keep it from his nosy little sister, Carrie. Then Mom's new friend, Mr. Croom, steps into the picture. What will Kevin do?